"remembering" uploads

[tykkemand]

Hi there,
We use xupload pro to let users upload files to our online printing service. The upload form is on the checkout pages. The problem is we would like to make a "go back" button during the checkout process, and when the users go back to the page with the xupload form they would have to upload their files again. Would it be possible to make xupload remember the uploads if the user have already uploaded a file during current session?
p.s if you wanna see what i mean you can go to out shop at NemPrint.dk tryk af flyers ,
add a product from the table and then goto checkout
Thanks, Soren